A Porphyrin Coordination Cage Assembled from Four Silver(I) Triazolyl-Pyridine Complexes

Chemistry : a European Journal
Pablo BallesterValérie Heitz

Abstract

The synthesis of a zinc(II) porphyrin 1 with four appended triazolyl-pyridine chelates is reported. Complexation of the porphyrin peripheral ligands with Ag(I) ions in a 1:2 binding stoichiometry afforded quantitatively the coordination cage [Ag4 (1)2 ](4+) . The assembly and disassembly processes of the cage were investigated in solution using UV/Vis spectroscopy. The mathematical analysis of the data obtained in the UV/Vis titration of 1 with Ag(I) confirmed the assembly in CH2 Cl2 /MeOH (90:10) solution of a species having a 1:2 porphyrin/silver stoichiometry and assigned to it an overall stability constant of 5.0×10(26)  M(-5) . The use of a model system allowed an independent assessment of a microscopic binding constant value (Km ) for the interaction between the triazolyl-pyridine ligand and Ag(I) . The coincidence that existed between the Km values extracted from the model system and the titration of 1 provided an indication of the quality and fit of the data analysis. It also allowed the calculation of the average effective molarity (EM) value for the three intramolecular processes that led to the cage assembly as 2.6 mM. Simulated speciation profiles supported the conclusion that at millimolar concentration and working...Continue Reading

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Citations

May 10, 2017·The Journal of Organic Chemistry·Laetitia SchoepffValérie Heitz
Jan 26, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Roan A S VasdevJames D Crowley
Jul 8, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·T T DangB Ventura
Oct 19, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Alexander J Metherell, Michael D Ward
Jun 9, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Marga C LensenJohannes A A W Elemans
Aug 11, 2018·Chemical Communications : Chem Comm·Clémence RoseSébastien Richeter
Dec 29, 2020·Physical Chemistry Chemical Physics : PCCP·Niloofar ZarrabiPrashanth K Poddutoori
Feb 11, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Galina M MamardashviliNugzar Zh Mamardashvili
Dec 28, 2017·The Journal of Organic Chemistry·Fu HuangYing Wang
Dec 21, 2016·Journal of the American Chemical Society·Wolfgang BrennerJonathan R Nitschke

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